Rotten Egg Smell During Acceleration
A rotten egg (sulfur) smell when accelerating in a 2020 Toyota Tacoma typically indicates a rich fuel mixture or a failing catalytic converter. The sulfur odor is caused by hydrogen sulfide in the exhaust not being properly converted.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal damage or clogging prevents proper conversion of sulfur compounds.
Rich fuel mixture – faulty oxygen sensor, fuel injector leak, or engine control issues cause excess fuel in the exhaust.
Fuel contamination – bad or high-sulfur fuel can produce the smell temporarily.
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes using an OBD-II scanner.
Inspect the catalytic converter for damage or clogging.
Test oxygen sensor readings and fuel trim values.
If no codes, consider a fuel system cleaner and ensure proper fuel quality.
If the smell persists, have a professional inspect the exhaust system.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
